[INFO] Change input color

[Doom83]

I use that code in ffmpeg for create che file
ffmpeg -i 01.asf -vf "scale=640:480:flags=lanczos,setsar=1" -map_metadata -1 -c:v libx264 -crf 18 -preset slow -color_primaries smpte170m -color_trc smpte170m -colorspace smpte170m -color_range tv -c:a aac -b:a 128k output.mkv

become matrix bt601, when i put in hybrid and save, matrix change in bt470bg 

Intervallo colore                      : Limited
Coefficienti matrici                    : BT.470 System B/G
matrix_coefficients_Original            : BT.601